Well, I can tell you .031" is 0.7874mm, which roughly translates to 0.8mm. But I can't tell you if it's right.

We've recently lost out imperial feeler gauges in our workshop, so I've had to dig out my metric set & write up a load of popular size conversions on the wall for my dad. I've got a converter app on my phone which does all the working out for me.

I'm at a rally right now, so could always ask someone if 31-thou is correct, but I expect someone will be along soon enough to let you know.

_________________Engines are just like Pringles .... one is never enough. I used to love tractors all I would ever think/talk about. Then one day out of the blue I went on to statinary engines, So you could say I'm an extractor fan.

i bought an imperial set from halfrauds for 3.95, i got the imperial set....watch though as they do sell a set thats metric and imperial but are metric ones with ip measurements.....sizes look weird lol.

tappet gap .031" when cold in the lister instruction book.tappet clearances (cold) .005 to .010 ins in the overhauling book,

Actually, just for the record (& it's not like me to jump to the defence of Halfrauds) I've got a set of their "Metric & Imperial Feeler Gauges" & they are all in imperial first & foremost, with metric equivalents stamped on.

It's one of the sets I bought on fleaBay, from a proper seller as well, he'd made a very poor attempt to cross out the name Halfords on the packet, of coures he could've taken it out of the packet altogether, as Halfords don't stamp their names on the actual gauge!

This ex-Halfords set could be old stock or something, I don't know, but it's only a 16 leaf set, & doesn't have the tiny .0015" leaf, instead starting at .002" & it only goes up to something like .014", whereas my nice new big 26 leaf set has everything from .0015 right up to .025 with every thou in-between, a few of the smaller ones going up in half thou steps as well. They came from here....

I was looking for a set of feeler gauges myself as I've lost another set which I've only used a few times I found these and I think they should do me and a reasonable quality. So not sure which set to get, these or the ones Nuts has bought, as his are better value.

_________________Engines are just like Pringles .... one is never enough. I used to love tractors all I would ever think/talk about. Then one day out of the blue I went on to statinary engines, So you could say I'm an extractor fan.

stationary stu wrote:I was looking for a set of feeler gauges myself as I've lost another set which I've only used a few times I found these and I think they should do me and a reasonable quality. So not sure which set to get, these or the ones Nuts has bought, as his are better value.

Well, the set I got I am very pleased with. They look a little untidy on the hinge, but not too bad everywhere else. (let's see if I can get a pic to show you what I mean)....

Also, there isn't much spare thread on the thumbscrew bit, but then there never is on feelers.

I'm happy with them, although I would say they look a little rough round the edges. But then I think it's difficult to get a large set of leaves like this looking tidy, as there's so many of them.

The markings are clear though & they are all easy to find, also there is EVERY single thou from 1.5 right up to 25, so no maths to do. The Metric markings are secondary, so they are an imperial set foremost, with metric markings on each leaf.

Up to you at the end of the day, I'm just letting you know what I think & giving my honest opinion.

Like you say the hinge end doesn't matter, one of the main bug bears with feeler gauges are that the sizes are difficult to read even on a new set but they look clear and easy to read. Look as if they would do the job for me.

Stu.

_________________Engines are just like Pringles .... one is never enough. I used to love tractors all I would ever think/talk about. Then one day out of the blue I went on to statinary engines, So you could say I'm an extractor fan.